The project has been running smoothly; initiation phase is complete and the team is working on all aspects of planning. You had meetings with stakeholders several times to collect requirements and as a result, requirements documentation is almost complete, as are high-level and detailed design documents. As construction begins on the project, several stakeholders have indicated the need for changes to the requirements set. They are claiming these elements were missed in the initial requirements collection process, and they want you to add these elements to the project immediately. You perform an impact assessment and get it back to them only to hear that they are not going to allow any changes in the project budget or the timeline to complete these additional elements. What is the most effective tool that you could use to prevent this instance of scope creep? a.Change control systemb.Configuration management system c.Murder Boardd.Work Authorization System